Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare a non-read-only, non-idempotent, open-world mutation, and the description adds real behavior beyond them: leases expire, a held lease yields 'lease_conflict with lease_expires_at', and review is performed by the project lead (an implicit authorization constraint). It does not say what happens to an existing deliverable when a task is reopened, which is the main residual gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loads the concept ('Expiring task leases'), then packs the action chain and edge cases into short arrow-linked clauses with zero filler. Every clause conveys either a parameter mapping or a failure mode; nothing is restated from the schema or annotations.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 7-parameter, no-output-schema mutation tool this covers the happy path, the error path, and the authorization actor. The trailing phrase 'Coordination only' is under-explained, and there is no hint about what a submit or review returns, but the missing pieces are minor against the overall coverage.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is only 14% (just idempotency_key), so the description must carry the load and largely does: lease_seconds for claim, deliverable_ids/note for submit, decision/note for review, note=reason for reopen. It leaves renew's lease_seconds and the task_id argument implicit, and never says which parameters are required per action.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

Names the resource (tasks) and enumerates every operation with its key argument, e.g. 'claim (lease_seconds) → submit (deliverable_ids, note)'. The lifecycle framing makes it immediately distinguishable from its siblings, none of which touch task leases. It stops short of a plain one-line statement of what the resource is, relying on the title for that.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The arrow chain 'claim → submit → review' tells the agent the required order of operations, and 'renew/release your lease' scopes those actions to a lease you already hold. 'reopen challenges a result (note=reason)' explains the exceptional path. No explicit when-not conditions or prerequisites are stated, which keeps it below a 5.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.